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  • AMC6821-Q1 Intelligent Temperature Monitor and PWM Fan Controller

    • SBAS475A June   2009  – January 2023 AMC6821-Q1

      PRODUCTION DATA  

  • CONTENTS
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  • AMC6821-Q1 Intelligent Temperature Monitor and PWM Fan Controller
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Functional Block Diagram
    2. 8.2 Feature Description
      1. 8.2.1 ADC Converter
      2. 8.2.2 Temperature Sensor
        1. 8.2.2.1 Series Resistance Cancellation
        2. 8.2.2.2 Reading Temperature Data
        3. 8.2.2.3 Temperature Out-of-Range Detection
        4. 8.2.2.4 Remote Temperature Sensor Failure Detection
      3. 8.2.3 PWM Output
      4. 8.2.4 PWM Waveform Setting
      5. 8.2.5 Fan Speed Measurement
        1. 8.2.5.1 Tach-Data Register
          1. 8.2.5.1.1 Reading the Tach Data Register
          2. 8.2.5.1.2 RPM Measurement Rate
          3. 8.2.5.1.3 Select Number of Pulses/Revolution
          4. 8.2.5.1.4 Tach Mode Selection
          5. 8.2.5.1.5 Fan RPM Out-of-Range Detection
      6. 8.2.6 Fan Failure Detection
      7. 8.2.7 FAN-FAULT Pin
      8. 8.2.8 Fan Control
        1. 8.2.8.1 THERM Pin and External Hardware Control
          1. 8.2.8.1.1 THERM Pin as an Output
          2. 8.2.8.1.2 THERM Pin as an Input
        2. 8.2.8.2 Fan Spin-Up
        3. 8.2.8.3 Normal Fan Speed Control
          1. 8.2.8.3.1 Software DCY Control Mode
          2. 8.2.8.3.2 Software-RPM Control Mode (Fan Speed Regulator)
          3. 8.2.8.3.3 Auto Temperature Fan Mode
      9. 8.2.9 Interrupt
        1. 8.2.9.1 OVR Pin
        2. 8.2.9.2 SMBALERT Pin
        3. 8.2.9.3 SMBALERT Interrupt Behavior
        4. 8.2.9.4 Handling SMBALERT Interrupts
    3. 8.3 Device Functional Modes
    4. 8.4 Programming
      1. 8.4.1 SMBus Interface
        1. 8.4.1.1 Communication Protocols
      2. 8.4.2 SMBus Alert Response Address (ARA)
      3. 8.4.3 Power-On Reset and Start Operation
    5. 8.5 Register Map
      1. 8.5.1 Register Description
        1. 8.5.1.1 Device Configuration Registers
        2. 8.5.1.2 Device Status Registers
        3. 8.5.1.3 Fan Controller Registers
        4. 8.5.1.4 Temperature Data Registers
        5. 8.5.1.5 Temperature Limit Registers
          1. 8.5.1.5.1 Tach-Data Register
          2. 8.5.1.5.2 Tach Setting Register
          3. 8.5.1.5.3 Tach Low Limit Register
          4. 8.5.1.5.4 Tach High Limit Register
  9. 9 Application and Implementation
    1. 9.1 Power Supply Recommendations
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information
  12. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • DBQ|16
    • MSOI004H
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • sbas475a_oa
  • sbas475a_pm
search No matches found.
  • Full reading width
    • Full reading width
    • Comfortable reading width
    • Expanded reading width
  • Card for each section
  • Card with all content

 

DATA SHEET

AMC6821-Q1 Intelligent Temperature Monitor and PWM Fan Controller

1 Features

  • Qualified for automotive applications:
    • Junction temperature: –40°C to +150°C, TJ
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Remote temperature sensor:
    ±3°C accuracy, 0.250°C resolution
  • Local temperature sensor:
    ±3°C accuracy, 0.250°C resolution
  • PWM controller
  • PWM frequency: 10 Hz to 40 kHz
  • Duty cycle: 0% to 100%, 8 bits
  • Automatic fan speed control loops
  • SMBus interface
  • Power: 2.7 V to 5.5 V
  • Package (green): SSOP-16 (4mm × 5mm)
  • RoHS-compliant
  • Latch-up exceeds 100 mA
    per JESD78B - class I

2 Applications

  • ADAS domain controller
  • Drive assist ECU
  • Digital cockpit processing unit
  • Surround view system ECU

3 Description

The AMC6821-Q1 is an intelligent temperature monitor and pulse-width modulation (PWM) fan controller. It is designed for noise-sensitive or power-sensitive applications that require active system cooling. Using either a low-frequency or a high-frequency PWM signal, this device can simultaneously drive a fan, monitor remote sensor diode temperatures, and measure and control the fan speed so that it operates with minimal acoustic noise at the lowest possible speed.

Package Information(1)
PART NUMBERPACKAGEBODY SIZE (NOM)
AMC6821-Q1SSOP (16)4.90 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
GUID-D183F19B-9934-4A11-BA17-BFEB9DE3C994-low.gif Functional Block Diagram

4 Revision History

Changes from Revision * (June 2009) to Revision A (January 2023)

  • Updated the numbering format for tables, figures, and cross-references throughout the documentGo
  • Added the Applications section, the ESD Ratings table, Thermal Information table, and the Application and Implementation sectionGo
  • Added Functional Safety information to the Features sectionGo
  • Deleted Ordering Information table. Content moved to the Mechanical, Packaging, and Orderable Information sectionGo
  • Added the I/O column to the Pin Functions tableGo

 
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